Apparatus for grinding or crushing foundry-sand, &amp;c.



' PATENTBD JAN. 30, 1906.

' P. BONVILLAIN. APPARATUS FOR GRINDING 0R GRDSHING FOUNDRY SAND,

ASHEETS-BHEET 1.

APPLICATION I'IL-BD JUNE 1, 1904.

PATENTED JAN. 30, 1906.

- P. BONVILLAIN. APPARATUS FOR GRINDING 0R GRUSHING FOUNDRY SAND, 8w.

APPLICATION II LEDJUNE 1, 1904.

2 SHEETS-SHBBT 2.

UNITED STATES PATENT OFFICE.

PHILIBERT BONVILLAIN, OF PARIS, FRANCE.

APPARATUS FOR GRINDING on CRUSHINIG FOUNDRY-SAND, et

Specification of Letters Patent.

Patented Jan. 30, 1906.

Application filed June 1 1904. Serial No. 210,748.

. of which the following is a specification.

This invention relates to apparatus for grinding or crushing wet granular material, such as foundry-sand.

In the accompanying drawings, which illustrate, by Way of example, a crusher according to this invention, Figure l is a longitudinal section of the crusher;.Fig. 2, a cross-section,

and Fig. 3 is a plan corresponding to Fig. 1. Fig. 4 is a longitudinal section of amodified form of crusher. Fig. 5 is a cross-section, and Fig. 6 a plan view corresponding with Fig. 4.

The crusher comprises a hollow cylinder a, the axis of which is inclined at an angle to the horizontal. It rests on several pairs of. rollers b b, the brackets of which are mounted on a suitable frame 0. A support (Z, mounted on the frame 0 near the lower end of the cylinder a, carries rollers e 6, against which rests the corresponding edge of the cylinder (4. The rollers'e c keep the cylinder in position as it bears against them during its rotation. On the support d a plate f is arranged so that it partially closes the lower end of the cylinder a. The interior of the cylinder is provided with a scraper g, comprising a sheet-metal plate provided at its ends with trunnions it, carried by brackets '5, a lever 7' having a balancewveighto being mounted on the end of one of the trunnions 7L and tending to force the upper edge of the scraper against the inner wall of thecylinder a, as shown in Fig. 2.

ln theinterior of the cylinder are arranged three series of cylindrical rollers l; lot of different diameters, which owing to their weight always keep in the lower portion of the cylin der (1. and are tangential to each other, or nearly so.

In the construction shown in Figs. 1, 2, and 3 the rollers Z; I) are arranged in pairs on each side of the cylinder, those on the same side being mounted on one and the same spindle n. The spindles w. '11- are each provided with beveled pinions 0 u, engaging with pinions p mounted on a spindle provided at one of its ends with a loose pulley r and a fast pulley x. The pulley x is driven from any motor by means of a belt and transmits movement to the pinions p 22, mounted on the same spindle, said pinions driving the pinions 0 0, the spindles n n, and the rollers I) b, the result being that the cylinder a is caused to rotate while its lower end bears against the rollers e e. The cylinder (1. may be mounted and rotated in any other suitable manner. For instance, it may be supported on rollers Z) 7/, Figs. 4 and 5. and provided centrally with a toothed ring or pulley 0, driven in any convenient manner. The series of rollers Z: I m may extend the whole length of the cylinder (4, as in Fig. 1,

or a space a may be left at the upper end of the cylinder, into which the sand is introduced by hand or mechanically through the open end of or through an opening in the end of the cylinder.

The sand thus receives a preliminary mixing 'in this chamber before it iscarried up in the rotation of the cylinder by scoops a and deposited upon an inclined delivery-plate (6*, from whence it descends to the crushing-rolls. The sand, owing toits wet state, adheres to the inner face of the cylinder and is carried round by it in its rotation, but is detached from it at the upper generatrix by the scraper g, and then it falls between the rollers l; Zm, which crush it again and again. As the rollers it Z on are of, different diameters, they necessarily have different speeds of rotation, and the'result is that there is friction between them, which assists the grinding of the sand.

It must be pointed out that, owing to the I inclination of the cylinder (0, each particle of sand is carried away byit in an oblique plane, while, owing to the action of the scraper 9, these particles fall down in a vertical direction, owing to the action of gravity. The result is that all the particles of sand advance continuously until they leave the cylinder, making their exit through the aperture between the bottom edge of the plate f and the lower edge of the cylinder It. The plate f. as will be seen, retains the rollers l l m, which otherwise would come out of the cylinder, owing to its inclination. The scraper y can be divided by means of saw-cuts into narrow or flexible-portions or sections after the manner of a comb, so as to secure its better contact with the inner wall of the cylinder (1 it may also be formed of a series of small flexible ovcrlap 'iing plates g riveted in place upon a plate as shown in Figs. 1 and 5, and

ulent products.

shown in Fig. 1. The balance-weight c is adjustable on the lever j, so that its positioncan be suitably regulated.

This crushercan be used for treating sand of various kinds, as well as any other pulver- Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is In an apparatus for grinding or crushing foundry-sand and other similar granular materials, the combination with a hollow rotatable cylinder, of three series of internal rollers of different diameterstouching each other I5 and the interior wall of the roller, a scraper in contact with the upper generatrix of the said wall of the roller, and a counterbalancele ver adjustably mounted upon the axis of said scraper, substantially as shown and described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PHILIBERT BONVILLAIN.

Witnesses:

PAUL BACARD,

HANSON U. COKE. 

